Customers who spend more £27 or more will have to type in a password they receive vis text

The Payment Services Directive (PSD2), will come into force across the whole of Britain by September 2019.

It is currently unclear what happens for people without phone signal or a mobile device.

James Daley, the managing director of Fairer Finance, told The BBC: "Banks are not yet great at looking after people at the margins - because they're disabled, or because they live with no mobile coverage.

"These systems are designed for the 95% - while the remaining 5% are hung out to dry."

UK Finance, which represents the UK banking and finance industry, told its members that they need to find other ways of verifying their customers' identities.

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